Reversing mechanism



J. J. PUKT REVERSING MECHANISM Aug. 25, 1953 2 Sheets-Sheet l Filed Feb. 23, 1951 INVENTOR JOSEPH J. PUKT ATTORNEY J. J. PUKT REVERSING MECHANISM Apg. 25, 1953 2 Sheets-Sheet 2 Filed Feb. 23, 1951 UWENTORv JOSEPH J. PUK-r ATTORNEY Patented Aug. 25, 1953 UNITED STATES PATENT OFFICE REVERSING MECHANISM Joseph J. Pukt, Randolph, Mass., assignor to Armstrong Cork Company, Lancaster, Pa., a corporation of Pennsylvania Application February 2s, 1951, serial No. 212,282

3 Claims. l

This invention relates to a control for a reversing mechanism and is concerned particularly with an arrangement for automatically reversing the travel of a reciprocating carriage, such as the reciprocating carriage of a grinding machine.

An object of the invention is to provide a control for a reversing mechanism which will automatically effect disengagement of the carriagetraversing drive, preferably through a clutch, and will automatically actuate a reversing lever effective for engaging a reversible carriage driving mechanism. Y

A further object of the invention is to provide an arrangement for automatic clutch disengagement on a reciprocating carriage type machine and for manual re-engagement of the clutch.

Other objects of the invention will be apparent from a consideration of the following description of a preferred embodiment of the invention.

The device of the present invention comprises generally a clutch control cam mounted on the reciprocating carriage and movable with it. A cam follower is mounted on the clutch control lever and is disposed in the path of travel of the clutch control cam, engagement of the clutch control cam with the follower causing the clutch lever to be pivoted toa clutch-disengaging position. The cam follower is pivoted to the clutch control lever for manual movement to a position out of engagement with the clutch control cam through a hand lever which is attached to the cam follower. This permits manual reengagement of the clutch upon'completion of a cycle of operation of the traversing carriage. -A reversing stop isr also mounted on the carriage and is movable with it. The stop is engageable with the reversing control lever of the machine to move the lever to a reversing position upon each reciprocation of the carriage. -The cam and stop are so positioned on the carriage that the clutch control lever is moved to disengage the clutch prior to actuation of the reversing control lever. An adjustable actuator for the reversing control lever may be provided to actuate the lever and cause the carriage to travel in the reverse direction, the clutch remaining in engagement. This actuator may be removably secured to one of the control members in position to engage the reversing lever prior to engagement of the clutch control lever cam follower with the cam on the control member, or a separate actuator may be secured directly to the carriage.

Preferably a pair of cams and a pair of stops are provided on the carriage in spaced positions to control the operation of the carriage. Y The invention will be described more specifical- 2 ly in conjunction with the attached drawings, in

which:

Figure 1 is a perspective view showing the mechanism of the present invention mounted upon a conventional Norton cylindrical grinding machine, the grinding machine being shown in dotted lines and the control mechanism in solid lines;

Figure 2 is an end elevation of a portion of the control mechanism, shown at the right in Figure 1,the parts being partially broken away; and

Figure 3 is a side elevation of the clutch cam follower' and hand lever.

Referring to Figure 1, there is shown a grinder having a base 2, a reciprocating carriage 3, and a rotatable grinding wheel 4. The workpiece to be ground is indicated at 5, the same being mounted in appropriate centers for revolution about its axis. 3 is provided with a T-slot G which extends .along the full length of the carriage, and mounted in the slot 6 are control members generally indicated at I and 8. Each of the control members is essentially the same but of opposite hand. Each control member includes a mounting plate 9 which has secured thereto a clutch control cam Ill and a xed reversing control lever stop Ii mounted thereon. An adjustable actuator I2 for the reversing control lever I3 is secured to mounting plate 9, one such actuator I2 being provided on control member 8 but not on control member 'l in the embodiment shown in Figure l. Each of the control members 'I and 8 is secured in adjusted position on the carriage 3 by a bolt I4 which passes through the mounting plate 9 and Y has a T-head which is received within the slot 6 in the carriage 3, as shown in Figure 2. A nut I5 is provided for the bolt ll to clamp the member inadjusted position on the reciprocating carriage.

A clutch lever I6 is pivoted to the base 2 as indicated at I'I in Figure l, and a cam follower I8 is pivoted to the lever I6 at I9 as shown in, Figure 2. The cam follower I8 includes a roller 20 which is mounted for revolution on a spindle 2| secured to a cam follower plate 22. A stop 23 is provided on the cam follower which is engageable with the clutch lever I6 and limits downward movement of the cam follower to the position shown in Figure 2. A spring 24 is provided for normally holding the cam follower in its lowered position for proper engagement with cam surface Ill with stop 23 in engagement with the clutch lever I5. The spring 24 is attached to the cam follower -IB by a connecting pin 25 secured It will be noted that the carriage Y to the cam follower plate 22; the opposite end of the spring 24 is connected to a pin 25 which is secured to the clutch lever support as shown in Figure 1.

A hand lever 21 is provided for pivoting the cam follower about pivot I9. The lever 21 is preferably formed integrally with the cam follower plate 22. The clutch control lever` I6 is provided with a recess 28 which receives the cam hand lever 21 so that the operator may grasp both the clutch control lever and the cam hand lever simultaneously, rst displacing the cam hand lever to a position within the recess 28 in the clutch control lever I6, thus elevating the roller 20 away from the cam I0, and then pushing the clutch control lever forwardly to re-engage the clutch.

The reversing control lever stop I I is preferably welded to the plate 9 in a predetermined location,

fixed by the position of the cam IB, the clutch control lever id, and the reversing control lever I3, so as to provide for disengagement of the clutch prior to or simultaneously with reversing of the carriage drive. This automatically stops the carriage and positions the reversing mechanism to reverse the traverse motion of the carriage when the clutch is re-engaged. The reversing control lever I3 is pivoted at 29 to the machine frame 2 and may be effective for bringing into mesh suitable reversing gears disposed within the base 2 and not shown. Mounted on the lever I3 is an adjustable plate 3B which carries a contacting roller 3i which is engaged by the reversing control lever stops I i as the carriage moves one of the stops II into engagement with the roller 3i, pivoting the reversing control lever I3 about pivot 29 and bringing the carriage-reversing mechanism into operation.

In the operation of the device, the members 'I and 8 are positioned on the carriage 3 in the y desired locations, as shown in Figure l, depending upon the length of the workpiece 5 to be nished; and if adjustable actuator i2 is provided, it is adjusted to effect reversal of the carriage after the desired travel has been effected. The grinding wheel :i is rotated, and the workpiece E is likewise rotated. The operator engages the clutch by manual operation of the clutch control lever I5 and the cam hand lever 2l, and the carriage 3 is traversed to the right. The reversing control lever actuator I2 will engage the roller 3i on the reversing control lever i3 and the direction of motion of the carriage 3 will be reversed, the carriage now travelling to the left. This will bring the cam Iii of control member i into engagement with roller 20 of the cam follower i8 which actuates the clutch control lever IE'S, disengaging the clutch and arresting further movement of the carriage. At the same time, stop II of the control member I will have engaged the roller 3l on the reversing control lever I3, shifting the same to the left for reverse motion of the carriage upon re-engagement of the clutch. This automatic reversing arrangement is desirable in the finishing of the surface of tubes of rubber compound, the initial pass of the grinder over the workpiece providing a rough cut, and the second pass in the reverse direction providing a finishing cut.

If it is desired to start the grind from the headstock end of the machine (the left-hand portion of the machine as viewed in Figure l) instead of the tailstock end (the right-hand portion as viewed in Figure l) the reversing control lever actuator I2 will be positioned on the control member 'I instead of on the control member 8, and the carriage will be started at the left or headstock end of the machine and will then move to the right or tailstock end of the machine, automatically reverse, and then move to the left and stop at the headstock end of the machine.

Should it be desired to stop the carriage after movement in a single direction, the `actuator I2 is removed. Then each of the control members 'i and 8 will be effective for disengaging the clutch and reversing the carriage reverse control lever, placing the carriage traversing mechanism in position for reverse travel upon the next reengagement of the clutch.

I claim:

1. In a reversing mechanism control for a machine having a reciprocating carriage with a clutch control lever and a reversing control lever for the carriage, the combination of a clutchactuating cam mounted on the carriage and movable therewith, a cam follower mounted on the clutch control lever and engageable with said cam to move said clutch control lever to a clutch disengaging position, means for pivoting said cam follower to said clutch control lever for movement to a position out of engagement with said clutch-actuating cam, a hand lever attached to said cam follower for manually pivoting said cam follower, stop-engaging means on said reversing control lever lying along the path of movement of said carriage, and a stop mounted on said carriage and movable with said carriage in a path intersecting said stop-engaging means and so positioned with respect to said clutch-actuating cam as to engage said stop-engaging means on said reversing control lever to move the same to a reversing position subsequent to movement of clutch control lever to a clutch-disengaging position.

2. In a reversing mechanism control for a machine having a reciprocating carriage with a clutch control lever and a reversing control lever for the carriage, the combination of a pair of clutch-actuating cams mounted on the carriage in spaced relationship and movable therewith, a cam follower mounted on the clutch control lever alternately engageable with said clutch-actuating cams to move said clutch control lever to a clutch-disengaging position upon reciprocation of said carriage to predetermined positions at opposite ends of each stroke thereof, means for pivoting said cam follower to said clutch control rever, a hand lever attached to said cam follower for manual pivoting of said cam follower, stopengaging means on said reversing control lever lying along the path of movement of said carriage, and a pair of stops complementary to said clutch-actuating cams, mounted in spaced relationship on saidr carriage, movable with said carriage in paths intersecting said stop-engaging means on said reversing control lever, and each so positioned with respect to its said complementary clutch-actuating cam as to engage said stopengaging means on said reversing control lever to move the same to a reversing position subsequent to movement of said clutch control lever to a clutch-disengaging position.

3. In a reversing mechanism control for a machine having a reciprocating carriage with a clutch control lever and a reversing control lever for the carriage, the combination of a clutchactuating cam mounted on the carriage and movable therewith, a cam follower mounted on the clutch control lever engageable with said clutchactuating cam to move said clutch control lever to a clutch-disengaging position upon reciprocation of said carriage to a predetermined position, means for pivoting said cam follower to said clutch control lever, a hand lever attached to said cam follower for manual pivoting of said cam follower, actuator-engaging means on said reversing control lever lying along the path of movement of said carriage, a, stop, and a reversing control lever actuator, said stop and actuator being mounted on said carriage in spaced relationship and movable With said carriage in paths which alternately intersect said actuator-engaging means on said reversing control lever, said actuator being positioned to engage said actuatorengaging means on said reversing control lever to move the same to a reversing position, and said stop being so positioned with respect to said 6 clutch-actuating cam as to engage said actuatorengaging means on said reversing control lever to move the same to a reversing position subsequent to movement of said clutch control lever to a clutch-disengaging position, whereby said carriage will automatically make a complete reciprocation and come to rest at the place of beginning.

JOSEPH J. PUKT.

References Cited in the le of this patent UNITED STATES PATENTS Number 

